Download App

7. Alternating current — Physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 SciencePhysics7. Alternating current1 Mark
MCQ
Given below are two statements:

Statement $I$: An $AC$ circuit undergoes electrical resonance if it contains either a capacitor or an inductor.

Statement $II$: An $AC$ circuit containing a pure capacitor or a pure inductor consumes high power due to its non-zero power factor.

In the light of above statements, choose the correct answer from the options given below

  • ✓
    Both Statement $I$ and Statement $II$ are false
  • B
    Statement $I$ is true but Statement $II$ is false
  • C
    Both Statement $I$ and Statement $II$ are true
  • D
    Statement I is false but Statement $II$ is true
✓

Answer

Correct option: A.
Both Statement $I$ and Statement $II$ are false
a
For resonance, $\phi=0$, hence both inductor and capacitor must be present. Also power factor is zero for pure inductor or pure capacitor hence both the component consume zero average power.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "M.C.Q (1 Marks)" from 7. Alternating current→7. Alternating current — all question types→Physics STD 12 Science question papers→CBSE Board STD 12 Science question papers→CBSE Board question paper generator→

Similar questions

The focal length of the objective lens of a compound microscope is
→
As shown in figures, three identical polaroids $P_1$, $P _2$ and $P _3$ are placed one after another. The pass axis of $P_2$ and $P_3$ are inclined at angle of $60^{\circ}$ and $90^{\circ}$ with respect to axis of $P _1$. The source $S$ has an intensity of $256 \frac{ W }{ m ^2}$. The intensity of light at point $O$ is $...........\frac{ W }{ m ^2}$.
→
If current flowing through a conductor is doubled then the heat produced in it is:
→
Given below are two statements:

Statement $I$ : Photovoltaic devices can convert optical radiation into electricity.

Statement $II$ : Zener diode is designed to operate under reverse bias in breakdown region.

In the light of the above statements, choose the most appropriate answer from the options given below

→
The voltage across the $10\, \Omega$ resistor in the given circuit is $x$ volt.

The value of $'x'$ to the nearest integer is..........

→
In a coil of resistance $8 \Omega$, the magnetic flux due to an external magnetic field varies with time as $\phi=\frac{2}{3}\left(9- t ^{2}\right)$. The value of total heat produced in the coil, till the flux becomes zero, will be $....J$
→
Which of the following is most unstable
→
The electric resistance of a certain wire of iron is R. If its length and radius are both doubled, then
→
At very high frequencies, the effective impendance of the given circuit will be $....\Omega$
→
The kinetic energy of an electron which is accelerated through a potential of $100$ volts is
→